It is, at least, in James Webb https://www.stsci.edu/contents/newsletters/2018-volume-35-is... for the scheduling system.

Scheduling runs ground side as normal Unix app

Surely that doesn't matter? Seems like they can be real-time, even if they are no longer?

What am I missing?

You're missing that I asked for current projects in Lisp.

That's completely irrelevant, though.

- Claim: "it is possible to write hard-real-time lisp, as evidenced by people having done it in the past."

- You: "nobody is doing it right now"

That's not a counterpoint.

I have no idea what you are even talking about. I'm asking about current projects in Lisp for real time, so it's very relevant. You might need to work on your reading comprehension.